Table 1 Main characteristics of the included studies
Study | Year | Region | Study design | Participates (counting) | Age a (year) | Gender (male/female) | Tumor location | Specimen extraction site | NOS score | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
NOSE-LAR group | AISE-LAR group | NOSE-LAR group | AISE-LAR group | NOSE-LAR group | AISE-LAR group | |||||||
Hisada et al. | 2014 | Japan | Retrospective study | 20 | 50 | 63.7 (9) | 66.3 (11) | 12/8 | NR | Rectum | Anus | 5 |
Hu et al. | 2019 | China | Retrospective study | 26 | 26 | 63.1 (8.3) | 61.5 (7.6) | 17/9 | 15/11 | Rectum | Anus | 7 |
Ng et al. | 2018 | China | Retrospective study | 35 | 38 | 65.14 (9.14) | 63.95 (9.19) | 20/15 | 22/16 | Sigmoid or rectum | Anus | 8 |
Zhang et al. | 2014 | China | Retrospective study | 65 | 132 | 56.1 (9.3) | 55.5 (9.5) | 32/33 | 57/75 | Sigmoid or rectum | Anus | 6 |
Zhou et al. | 2019 | China | Retrospective study | 52 | 52 | 55.6 (10.4) | 57.0 (10.7) | 27/25 | 27/25 | Sigmoid or rectum | Anus | 8 |
Xing et al. | 2017 | China | Retrospective study | 16 | 32 | 61.9 (11.8) | 62.4 (12.0) | 12/4 | 24/8 | Sigmoid | Anus | 7 |
Liu et al. | 2019 | China, Russia | Retrospective study | 356 | 412 | 64 (29–79) | 62 (32–81) | 192/164 | 235/177 | Rectum | Anus or vagina | 6 |
Saurabh et al. | 2017 | Taiwan | Retrospective study | 82 | 106 | 63.3 (13.9) | 64.7 (10.9) | 47/35 | 65/41 | Sigmoid or rectum | Anus | 6 |
Denost et al. | 2015 | France | Retrospective study | 122 | 98 | 63 (20–90) | 65 (25–85) | 70/52 | 69/29 | Rectum | Anus | 7 |
Wang et al. | 2019 | China | Retrospective study | 30 | 37 | 58.67 (8.45) | 59.70 (10.88) | 19/11 | 20/17 | Rectum | Anus | 7 |